The sound from these unique instruments is generated by moving the drum so that the vibrations of the spring are transmitted to the head, creating an indescribably and musically interesting sound that is a cross between a cuica, a thunder sheet, a suspended cymbal roll, a gong and the roar of a lion. Hold the drum horizontally (as if throwing a dart) with the spring dangling away from the head. Waggle your hand slowly or energetically for different and amazing sound effects. 5cm x 18 cm